Preparation method of mixed crystal phase heterojunction nano-cadmium sulfide with special morphology

Abstract

The invention relates to a preparation method of mixed crystal phase heterojunction nano-cadmium sulfide with a special morphology. The preparation method comprises the following steps: preparing a precursor cadmium hydroxide by a solvothermal method; obtaining nano-cadmium oxide by calcination; then, vulcanizing the prepared nano-cadmium oxide by a hydrothermal method to synthesize nano-cadmium sulfide of a cubic-hexagonal mixed crystal phase; and washing and drying the product to obtain the mixed crystal phase heterojunction nano-cadmium sulfide, wherein the morphology characteristics are shown as cadmium sulfide nano-particles with particle size of 20-50 nm and cadmium sulfide nano-rods with length of 60-120 nm and diameter of 10-25 nm. The obtained mixed crystal phase heterojunction nano-cadmium sulfide is used as a photocatalyst for degrading potassium dichromate solution and has excellent photocatalytic degradation performance.

Description

technical field [0001] The invention relates to a preparation method of nano cadmium sulfide with special morphology mixed crystal phase heterojunction with high catalytic performance and belongs to the technical field of nanometer materials. Background technique [0002] In recent years, heterojunction photocatalysts have attracted much attention due to their excellent catalytic properties in the process of photolysis of water for hydrogen production and degradation of organic pollutants. Recently, a new type of heterojunction, that is, a mixed-phase heterojunction formed by two different crystal phases of a semiconductor material, has been discovered. This special heterojunction structure can promote the effective transport of electrons and holes generated by photoexcitation in the desired direction, promote charge separation and prolong the lifetime of carriers, thus exhibiting excellent photocatalytic performance. [0003] Cadmium sulfide is an important II-VI semicondu...

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Problems solved by technology

From the perspective of the prior art, in the preparation process, some need to add organic coating reagents; some synthesis steps are cumbersome; some synthesis products have unsatisfactory catalytic efficiency

The study also found that the smaller the particle size of the nano-cadmium sulfide heterojunction, the higher the surface energy, the easier it is to agglomerate, and the lower its catalytic properties

These existing problems seriously restrict its wide application

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